Solar street lamps have now become the main facilities for the lighting of urban and rural roads. They are simple to install and do not need a lot of wiring. By converting light energy into electric energy and electric energy into light energy, they bring brightness to the night. Among them, rechargeable and discharged batteries play a key role.
Compared with the lead-acid battery or colloidal battery in the past, the lithium battery commonly used now is better in terms of specific energy and specific power, easier to realize rapid charging and deep discharge, and has a long service life, so it also brings us a better lamp experience.
However, there are differences between the quality of lithium batteries. Today we will start with their packaging forms to see what characteristics these lithium batteries have and which is better. There are often three packaging forms: cylindrical winding, square stacking and square winding.
1) Cylindrical battery (cylindrical winding type) generally adopts steel shell and aluminum shell. Mature process, small size, flexible grouping, low cost, mature process and good consistency; After grouping, the heat dissipation is not good, the design is heavy and the specific energy is low.
2) Square battery (square winding type), mostly steel shell in the early stage, and now aluminum shell in the majority. Good heat dissipation, easy design in groups, good reliability, high safety, including explosion-proof valve and high hardness; It is one of the mainstream technical routes with high cost, many models and difficult to unify the process level.
3) Lithium polymer battery (square laminated type), aluminum-plastic film as the outer packaging, with flexible size change, high specific energy, light weight and small internal resistance; Poor mechanical strength, difficult sealing process, complex group structure, poor heat dissipation design, no explosion-proof device, easy to leak, poor consistency and high cost.
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